+++ /dev/null
-#ifndef ELF_H_INCLUDED
-#define ELF_H_INCLUDED
-
-#include <stdint.h>
-
-/* Type for a 16-bit quantity. */
-typedef uint16_t Elf32_Half;
-typedef uint16_t Elf64_Half;
-
-/* Types for signed and unsigned 32-bit quantities. */
-typedef uint32_t Elf32_Word;
-typedef int32_t Elf32_Sword;
-typedef uint32_t Elf64_Word;
-typedef int32_t Elf64_Sword;
-
-/* Types for signed and unsigned 64-bit quantities. */
-typedef uint64_t Elf32_Xword;
-typedef int64_t Elf32_Sxword;
-typedef uint64_t Elf64_Xword;
-typedef int64_t Elf64_Sxword;
-
-/* Type of addresses. */
-typedef uint32_t Elf32_Addr;
-typedef uint64_t Elf64_Addr;
-
-/* Type of file offsets. */
-typedef uint32_t Elf32_Off;
-typedef uint64_t Elf64_Off;
-
-/* Type for section indices, which are 16-bit quantities. */
-typedef uint16_t Elf32_Section;
-typedef uint16_t Elf64_Section;
-
-/* Type for version symbol information. */
-typedef Elf32_Half Elf32_Versym;
-typedef Elf64_Half Elf64_Versym;
-
-
-/* The ELF file header. This appears at the start of every ELF file. */
-typedef struct {
- unsigned char e_ident[16]; /* Magic number and other info */
- Elf32_Half e_type; /* Object file type */
- Elf32_Half e_machine; /* Architecture */
- Elf32_Word e_version; /* Object file version */
- Elf32_Addr e_entry; /* Entry point virtual address */
- Elf32_Off e_phoff; /* Program header table (usually follows elf header directly) file offset */
- Elf32_Off e_shoff; /* Section header table (at end of file) file offset */
- Elf32_Word e_flags; /* Processor-specific flags */
- Elf32_Half e_ehsize; /* ELF header size in bytes */
- Elf32_Half e_phentsize; /* Program header table entry size */
- Elf32_Half e_phnum; /* Program header table entry count */
- Elf32_Half e_shentsize; /* Section header table entry size */
- Elf32_Half e_shnum; /* Section header table entry count */
- Elf32_Half e_shstrndx; /* Section header string table index */
-} Elf32_Ehdr;
-typedef struct {
- unsigned char e_ident[16]; /* Magic number and other info */
- Elf64_Half e_type; /* Object file type */
- Elf64_Half e_machine; /* Architecture */
- Elf64_Word e_version; /* Object file version */
- Elf64_Addr e_entry; /* Entry point virtual address */
- Elf64_Off e_phoff; /* Program header table file offset */
- Elf64_Off e_shoff; /* Section header table file offset */
- Elf64_Word e_flags; /* Processor-specific flags */
- Elf64_Half e_ehsize; /* ELF header size in bytes */
- Elf64_Half e_phentsize; /* Program header table entry size */
- Elf64_Half e_phnum; /* Program header table entry count */
- Elf64_Half e_shentsize; /* Section header table entry size */
- Elf64_Half e_shnum; /* Section header table entry count */
- Elf64_Half e_shstrndx; /* Section header string table index */
-} Elf64_Ehdr;
-
-/* Section header entry. The number of section entries in the file are determined by the "e_shnum" field of the ELF header.*/
-typedef struct {
- Elf32_Word sh_name; /* Section name (string tbl index) */
- Elf32_Word sh_type; /* Section type */
- Elf32_Word sh_flags; /* Section flags */
- Elf32_Addr sh_addr; /* Section virtual addr at execution */
- Elf32_Off sh_offset; /* Section file offset */
- Elf32_Word sh_size; /* Section size in bytes */
- Elf32_Word sh_link; /* Link to another section */
- Elf32_Word sh_info; /* Additional section information */
- Elf32_Word sh_addralign; /* Section alignment */
- Elf32_Word sh_entsize; /* Entry size if section holds table */
-} Elf32_Shdr;
-typedef struct {
- Elf64_Word sh_name; /* Section name (string tbl index) */
- Elf64_Word sh_type; /* Section type */
- Elf64_Xword sh_flags; /* Section flags */
- Elf64_Addr sh_addr; /* Section virtual addr at execution */
- Elf64_Off sh_offset; /* Section file offset */
- Elf64_Xword sh_size; /* Section size in bytes */
- Elf64_Word sh_link; /* Link to another section */
- Elf64_Word sh_info; /* Additional section information */
- Elf64_Xword sh_addralign; /* Section alignment */
- Elf64_Xword sh_entsize; /* Entry size if section holds table */
-} Elf64_Shdr;
-
-/* Legal values for sh_type (section type). */
-#define SHT_NULL 0 /* Section header table entry unused */
-#define SHT_PROGBITS 1 /* Program data */
-#define SHT_SYMTAB 2 /* Symbol table */
-#define SHT_STRTAB 3 /* String table */
-#define SHT_RELA 4 /* Relocation entries with addends */
-#define SHT_HASH 5 /* Symbol hash table */
-#define SHT_DYNAMIC 6 /* Dynamic linking information. Contains Elf32_Dyn/Elf64_Dyn entries. */
-#define SHT_NOTE 7 /* Notes */
-#define SHT_NOBITS 8 /* Program space with no data (bss) */
-#define SHT_REL 9 /* Relocation entries, no addends */
-#define SHT_SHLIB 10 /* Reserved */
-#define SHT_DYNSYM 11 /* Dynamic linker symbol table */
-#define SHT_INIT_ARRAY 14 /* Array of constructors */
-#define SHT_FINI_ARRAY 15 /* Array of destructors */
-#define SHT_PREINIT_ARRAY 16 /* Array of pre-constructors */
-#define SHT_GROUP 17 /* Section group */
-#define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */
-#define SHT_NUM 19 /* Number of defined types. */
-#define SHT_LOOS 0x60000000 /* Start OS-specific. */
-#define SHT_GNU_ATTRIBUTES 0x6ffffff5 /* Object attributes. */
-#define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table. */
-#define SHT_GNU_LIBLIST 0x6ffffff7 /* Prelink library list */
-#define SHT_CHECKSUM 0x6ffffff8 /* Checksum for DSO content. */
-#define SHT_LOSUNW 0x6ffffffa /* Sun-specific low bound. */
-#define SHT_SUNW_move 0x6ffffffa
-#define SHT_SUNW_COMDAT 0x6ffffffb
-#define SHT_SUNW_syminfo 0x6ffffffc
-#define SHT_GNU_verdef 0x6ffffffd /* Version definition section. */
-#define SHT_GNU_verneed 0x6ffffffe /* Version needs section. */
-#define SHT_GNU_versym 0x6fffffff /* Version symbol table. */
-#define SHT_HISUNW 0x6fffffff /* Sun-specific high bound. */
-#define SHT_HIOS 0x6fffffff /* End OS-specific type */
-#define SHT_LOPROC 0x70000000 /* Start of processor-specific */
-#define SHT_HIPROC 0x7fffffff /* End of processor-specific */
-#define SHT_LOUSER 0x80000000 /* Start of application-specific */
-#define SHT_HIUSER 0x8fffffff /* End of application-specific */
-
-/* Dynamic section entry. */
-typedef struct {
- Elf32_Sword d_tag; /* Dynamic entry type */
- union { Elf32_Word d_val; Elf32_Addr d_ptr; } d_un; /* Integer or address value */
-} Elf32_Dyn;
-typedef struct {
- Elf64_Sxword d_tag; /* Dynamic entry type */
- union { Elf64_Xword d_val; Elf64_Addr d_ptr; } d_un; /* Integer or address value */
-} Elf64_Dyn;
-
-/* Legal values for d_tag (dynamic entry type). */
-#define DT_NULL 0 /* Marks end of dynamic section */
-#define DT_NEEDED 1 /* Name of needed library */
-#define DT_PLTRELSZ 2 /* Size in bytes of PLT relocs */
-#define DT_PLTGOT 3 /* Processor defined value */
-#define DT_HASH 4 /* Address of symbol hash table */
-#define DT_STRTAB 5 /* Address of string table */
-#define DT_SYMTAB 6 /* Address of symbol table */
-#define DT_RELA 7 /* Address of Rela relocs */
-#define DT_RELASZ 8 /* Total size of Rela relocs */
-#define DT_RELAENT 9 /* Size of one Rela reloc */
-#define DT_STRSZ 10 /* Size of string table */
-#define DT_SYMENT 11 /* Size of one symbol table entry */
-#define DT_INIT 12 /* Address of init function */
-#define DT_FINI 13 /* Address of termination function */
-#define DT_SONAME 14 /* Name of shared object */
-#define DT_RPATH 15 /* Library search path (deprecated) */
-#define DT_SYMBOLIC 16 /* Start symbol search here */
-#define DT_REL 17 /* Address of Rel relocs */
-#define DT_RELSZ 18 /* Total size of Rel relocs */
-#define DT_RELENT 19 /* Size of one Rel reloc */
-#define DT_PLTREL 20 /* Type of reloc in PLT */
-#define DT_DEBUG 21 /* For debugging; unspecified */
-#define DT_TEXTREL 22 /* Reloc might modify .text */
-#define DT_JMPREL 23 /* Address of PLT relocs */
-#define DT_BIND_NOW 24 /* Process relocations of object */
-#define DT_INIT_ARRAY 25 /* Array with addresses of init fct */
-#define DT_FINI_ARRAY 26 /* Array with addresses of fini fct */
-#define DT_INIT_ARRAYSZ 27 /* Size in bytes of DT_INIT_ARRAY */
-#define DT_FINI_ARRAYSZ 28 /* Size in bytes of DT_FINI_ARRAY */
-#define DT_RUNPATH 29 /* Library search path */
-#define DT_FLAGS 30 /* Flags for the object being loaded */
-#define DT_ENCODING 32 /* Start of encoded range */
-#define DT_PREINIT_ARRAY 32 /* Array with addresses of preinit fct*/
-#define DT_PREINIT_ARRAYSZ 33 /* size in bytes of DT_PREINIT_ARRAY */
-#define DT_NUM 34 /* Number used */
-#define DT_LOOS 0x6000000d /* Start of OS-specific */
-#define DT_HIOS 0x6ffff000 /* End of OS-specific */
-#define DT_VERDEF 0x6ffffffc
-#define DT_VERDEFNUM 0x6ffffffd
-#define DT_LOPROC 0x70000000 /* Start of processor-specific */
-#define DT_HIPROC 0x7fffffff /* End of processor-specific */
-
-
-/* Symbol table entry. */
-typedef struct {
- Elf32_Word st_name; /* Symbol name (string tbl index) */
- Elf32_Addr st_value; /* Symbol value */
- Elf32_Word st_size; /* Symbol size */
- unsigned char st_info; /* Symbol type and binding */
- unsigned char st_other; /* Symbol visibility */
- Elf32_Section st_shndx; /* Section index */
-} Elf32_Sym;
-
-typedef struct {
- Elf64_Word st_name; /* Symbol name (string tbl index) */
- unsigned char st_info; /* Symbol type and binding */
- unsigned char st_other; /* Symbol visibility */
- Elf64_Section st_shndx; /* Section index */
- Elf64_Addr st_value; /* Symbol value */
- Elf64_Xword st_size; /* Symbol size */
-} Elf64_Sym;
-
-
-#endif
+++ /dev/null
-#include <algorithm>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#ifdef __APPLE__
-# include "elf.h"
-#else
-# include <elf.h>
-#endif
-
-#define DT_VERSYM 0x6ffffff0
-#define DT_VERNEEDED 0x6ffffffe
-#define DT_VERNEEDNUM 0x6fffffff
-
-template<typename ElfHeaderType /*Elf{32,64}_Ehdr*/,
- typename ElfSectionHeaderType /*Elf{32,64}_Shdr*/,
- typename ElfDynamicSectionEntryType /* Elf{32,64}_Dyn */>
-bool process_elf(uint8_t* bytes, size_t elf_file_size, char const* file_name)
-{
- if (sizeof(ElfSectionHeaderType) > elf_file_size) {
- fprintf(stderr, "termux-elf-cleaner: Elf header for '%s' would end at %zu but file size only %zu\n", file_name, sizeof(ElfSectionHeaderType), elf_file_size);
- return false;
- }
- ElfHeaderType* elf_hdr = reinterpret_cast<ElfHeaderType*>(bytes);
-
- size_t last_section_header_byte = elf_hdr->e_shoff + sizeof(ElfSectionHeaderType) * elf_hdr->e_shnum;
- if (last_section_header_byte > elf_file_size) {
- fprintf(stderr, "termux-elf-cleaner: Section header for '%s' would end at %zu but file size only %zu\n", file_name, last_section_header_byte, elf_file_size);
- return false;
- }
- ElfSectionHeaderType* section_header_table = reinterpret_cast<ElfSectionHeaderType*>(bytes + elf_hdr->e_shoff);
-
- for (unsigned int i = 1; i < elf_hdr->e_shnum; i++) {
- ElfSectionHeaderType* section_header_entry = section_header_table + i;
- if (section_header_entry->sh_type == SHT_DYNAMIC) {
- size_t const last_dynamic_section_byte = section_header_entry->sh_offset + section_header_entry->sh_size;
- if (last_dynamic_section_byte > elf_file_size) {
- fprintf(stderr, "termux-elf-cleaner: Dynamic section for '%s' would end at %zu but file size only %zu\n", file_name, last_dynamic_section_byte, elf_file_size);
- return false;
- }
-
- size_t const dynamic_section_entries = section_header_entry->sh_size / sizeof(ElfDynamicSectionEntryType);
- ElfDynamicSectionEntryType* const dynamic_section =
- reinterpret_cast<ElfDynamicSectionEntryType*>(bytes + section_header_entry->sh_offset);
-
- unsigned int last_nonnull_entry_idx = 0;
- for (unsigned int j = dynamic_section_entries - 1; j > 0; j--) {
- ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
- if (dynamic_section_entry->d_tag != DT_NULL) {
- last_nonnull_entry_idx = j;
- break;
- }
- }
-
- for (unsigned int j = 0; j < dynamic_section_entries; j++) {
- ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
- char const* removed_name = nullptr;
- switch (dynamic_section_entry->d_tag) {
- case DT_VERSYM: removed_name = "DT_VERSYM"; break;
- case DT_VERNEEDED: removed_name = "DT_VERNEEDED"; break;
- case DT_VERNEEDNUM: removed_name = "DT_VERNEEDNUM"; break;
- case DT_VERDEF: removed_name = "DT_VERDEF"; break;
- case DT_VERDEFNUM: removed_name = "DT_VERDEFNUM"; break;
- case DT_RPATH: removed_name = "DT_RPATH"; break;
- case DT_RUNPATH: removed_name = "DT_RUNPATH"; break;
- }
- if (removed_name != nullptr) {
- printf("termux-elf-cleaner: Removing the %s dynamic section entry from '%s'\n", removed_name, file_name);
- // Tag the entry with DT_NULL and put it last:
- dynamic_section_entry->d_tag = DT_NULL;
- // Decrease j to process new entry index:
- std::swap(dynamic_section[j--], dynamic_section[last_nonnull_entry_idx--]);
- }
- }
- } else if (section_header_entry->sh_type == SHT_GNU_verdef ||
- section_header_entry->sh_type == SHT_GNU_verneed ||
- section_header_entry->sh_type == SHT_GNU_versym) {
- printf("termux-elf-cleaner: Removing version section from '%s'\n", file_name);
- section_header_entry->sh_type = SHT_NULL;
- }
- }
- return true;
-}
-
-
-int main(int argc, char const** argv)
-{
- if (argc < 2 || (argc == 2 && strcmp(argv[1], "-h")==0)) {
- fprintf(stderr, "usage: %s <filename>\n", argv[0]);
- fprintf(stderr, " Processes ELF files to remove DT_VERNEEDED, DT_VERNEEDNUM, DT_RPATH\n"
- " and DT_RUNPATH entries (which the Android linker warns about)\n");
- return 1;
- }
-
- for (int i = 1; i < argc; i++) {
- char const* file_name = argv[i];
- int fd = open(file_name, O_RDWR);
- if (fd < 0) {
- char* error_message;
- if (asprintf(&error_message, "open(\"%s\")", file_name) == -1) error_message = (char*) "open()";
- perror(error_message);
- return 1;
- }
-
- struct stat st;
- if (fstat(fd, &st) < 0) { perror("fstat()"); return 1; }
-
- if (st.st_size < (long long) sizeof(Elf32_Ehdr)) {
- close(fd);
- continue;
- }
-
- void* mem = mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
- if (mem == MAP_FAILED) { perror("mmap()"); return 1; }
-
- uint8_t* bytes = reinterpret_cast<uint8_t*>(mem);
- if (!(bytes[0] == 0x7F && bytes[1] == 'E' && bytes[2] == 'L' && bytes[3] == 'F')) {
- // Not the ELF magic number.
- munmap(mem, st.st_size);
- close(fd);
- continue;
- }
-
- if (bytes[/*EI_DATA*/5] != 1) {
- fprintf(stderr, "termux-elf-cleaner: Not little endianness in '%s'\n", file_name);
- munmap(mem, st.st_size);
- close(fd);
- continue;
- }
-
- uint8_t const bit_value = bytes[/*EI_CLASS*/4];
- if (bit_value == 1) {
- if (!process_elf<Elf32_Ehdr, Elf32_Shdr, Elf32_Dyn>(bytes, st.st_size, file_name)) return 1;
- } else if (bit_value == 2) {
- if (!process_elf<Elf64_Ehdr, Elf64_Shdr, Elf64_Dyn>(bytes, st.st_size, file_name)) return 1;
- } else {
- printf("termux-elf-cleaner: Incorrect bit value %d in '%s'\n", bit_value, file_name);
- return 1;
- }
-
- if (msync(mem, st.st_size, MS_SYNC) < 0) { perror("msync()"); return 1; }
-
- munmap(mem, st.st_size);
- close(fd);
- }
- return 0;
-}
-
~mdw / termux-packages / commitdiff